Screen-holding structure to prevent sagging screen phenomenon

Abstract

The present invention relates to a screen-holding structure, and more specifically to a screen-holding structure to withstand the weight of the screen by means of a screen holding apparatus for the entire region or a part of the screen to prevent the phenomenon in which a screen held by a frame sags downward due to the weight of the screen. According to the present invention, the curved surface of the screen can be smoothly maintained by minimizing the downward sagging phenomena of the curved screen, thereby allowing content image to be projected onto the screen without distortion, and consequently allowing a viewing environment having a high sense of immersion and enhanced stereoscopic effect to be provided to an audience.

1 - 24 . (canceled) 
     
     
         25 . A structure for holding a screen, comprising:
 a frame in which a screen is held;   a strap for fixing the screen to the frame; and   a screen holding apparatus pulling the strap.   
     
     
         26 . The structure of  claim 25 , wherein:
 the frame comprises a pair of long-axis members formed in a first direction and a pair of short-axis members formed in a second direction, and   the long-axis members or the short-axis members have curvature of a specific size.   
     
     
         27 . The structure of  claim 26 , wherein the screen holding apparatus comprises:
 a reel which winds and pulls the strap; and   a motor which rotates the reel.   
     
     
         28 . The structure of  claim 26 , wherein the screen holding apparatus comprises a pulley on which the strap is hung. 
     
     
         29 . The structure of  claim 25 , wherein one or more straps are extended and connected to the screen holding apparatus. 
     
     
         30 . A structure for holding a screen, comprising:
 a screen;   a frame in which the screen is held; and   a screen holding apparatus which generates an attractive force and endures a weight of the screen held in the frame.   
     
     
         31 . The structure of  claim 30 , wherein:
 the frame comprises a pair of long-axis members formed in a first direction and a pair of short-axis members formed in a second direction, and   the long-axis members or the short-axis members have curvature of a specific size.   
     
     
         32 . The structure of  claim 31 , wherein the screen holding apparatus comprises:
 one or more suction holes; and   a suction unit which endures the weight of the screen by a suction force through the suction holes.   
     
     
         33 . The structure of  claim 31 , wherein the screen holding apparatus comprises a magnetic unit which endures the weight of the screen by a magnetic force. 
     
     
         34 . The structure of  claim 33 , wherein the screen comprises an area on which a magnetic material has been coated or an area to which sheet paper coated with a magnetic material has been attached. 
     
     
         35 . The structure of  claim 31 , wherein the screen holding apparatus comprises an electrostatic unit which endures the weight of the screen by an electrostatic force. 
     
     
         36 . The structure of  claim 31 , wherein the screen holding apparatus comprises:
 a ventilation unit which endures the weight of the screen by wind pressure generated by a wind; and   a ventilation hole which transmits the wind generated by the ventilation unit.   
     
     
         37 . The structure of  claim 31 , wherein:
 the frame further comprises one or more assistant members, and   the assistant member has curvature of a specific size.   
     
     
         38 . The structure of  claim 37 , wherein the screen holding apparatus is provided on the assistant member. 
     
     
         39 . A screen holding apparatus for preventing a screen held in a frame from hanging down, the screen holding apparatus comprising:
 a holding unit which endures a weight of some area of or entire screen by pulling a strap provided in the screen or generating an attractive force.   
     
     
         40 . The screen holding apparatus of  claim 39 , wherein the holding unit is a reel which winds and pulls the strap provided in the screen. 
     
     
         41 . The screen holding apparatus of  claim 40 , wherein the holding unit is a suction unit which endures the weight of some area of or the entire screen by generating a suction force. 
     
     
         42 . The screen holding apparatus of  claim 40 , wherein the holding unit is a magnetic unit which endures the weight of some area of or the entire screen by generating an attractive force according to a magnetic force. 
     
     
         43 . The screen holding apparatus of  claim 40 , wherein the holding unit is an electrostatic unit which endures the weight of some area of or the entire screen by generating an attractive force according to an electrostatic force. 
     
     
         44 . The screen holding apparatus of  claim 40 , wherein the holding unit is a ventilation unit which holds the weight of some area of or the entire screen by generating wind pressure according to a wind.